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Diagnostic Case Summary

There is a bad smell coming from the sink

Resolved

Plumbing · Started Jul 21, 2026 · by Pedro

Diagnostics

Sink Foul Odor Identification
Confirmed
Sink Odor Due to Dry P-Trap
Confirmed
Sink Plumbing System Overview
Confirmed
Sink Odor Due to Biofilm and Debris Buildup
Ruled out
Sink Odor Due to Blocked Vent Stack
Ruled out

Remedies

Refill and Seal the P-Trap to Restore the Water Barrier
This worked

Diagnostics and Remedies considered but not confirmed

Clean the Drainpipe and P-Trap to Remove Biofilm
Remedy considered
Sink Odor Due to Missing P-Trap
Diagnostic considered